38491891 has 8 divisors (see below), whose sum is σ = 40677120. Its totient is φ = 36322632.

The previous prime is 38491889. The next prime is 38491897. The reversal of 38491891 is 19819483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38491891 - 2¹ = 38491889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38491897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146 + ... + 8848.

It is an arithmetic number, because the mean of its divisors is an integer number (5084640).

Almost surely, 2^38491891 is an apocalyptic number.

38491891 is a deficient number, since it is larger than the sum of its proper divisors (2185229).

38491891 is a wasteful number, since it uses less digits than its factorization.

38491891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7985.

The product of its digits is 62208, while the sum is 43.

The square root of 38491891 is about 6204.1833467427. The cubic root of 38491891 is about 337.6419624088.

The spelling of 38491891 in words is "thirty-eight million, four hundred ninety-one thousand, eight hundred ninety-one".